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- Reliability of transperineal ultrasound for the assessment of the angle of progression in labor using parasagittal approach versus midsagittal approach.J Matern Fetal Neonatal Med. 2021; 34: 3175-3180
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The authors report no conflict of interest.
The authors declare no funding for this study.
Cite this article as: Yano E, Iriyama T, Sayama S, et al. The head direction to the angle of progression ratio: a quantitative parameter for intrapartum evaluation of cephalic malposition. Am J Obstet Gynecol MFM 2022;XX:x.ex–x.ex.